AP Photo/All Things DigitalIn this photo provided by All Things Digital, Foursquare CEO and founder Dennis Crowley is interviewed Tuesday, Dec. 7, 2010, at the D: Dive Into Mobile conference in San Francisco. The Syracuse University alumnus was named No. 5 on GQ's "Worst-Dressed Men of Silicon Valley" list.

There's no questioning Syracuse University graduate Dennis Crowley's accomplishments. He co-founded Dodgeball and sold it to Google in 2005. Then, in 2009, he co-founded Foursquare, the popular social network where more than 10 million users "check in" to their favorite locations.

Crowley told Forbes in April that 300,000 businesses had signed up to post deals on the site, notifying users of special offers close to their physical location. Though the company has not focused heavily on making profits yet, Celebrity Net Worth estimates the Foursquare CEO's net worth to be $30 million.

Showing a picture of Crowley wearing his Syracuse University hoodie at a press event, GQ wrote, "After you've received your diploma and laid your butterfly chair to rest, all college sweatshirts and the like should be reserved for lazy Sundays, grocery runs, and gym visits. Unless Crowley is making a social statement about the threat of student loan debt, it's time to graduate past the junior section."

Crowley defended his appearance in the photo on Twitter: "Ha, I had just gotten back from a weekend in Syracuse where I gave a commencement speech. Fav new hoodie :)" He also tweeted, "Honored to have made @GQfashion's "Worst Dressed in Tech list" http://t.co/TR9tEDn #CuseHoodie4life!"

Facebook CEO and founder Mark Zuckerberg, who often just wears a t-shirt, jeans and flip-flops, topped the list as the worst-dressed tech entrepreneur. The social network king was 52nd on Forbes' list of the "World's Billionaires" with $13.5 billion in earnings this past year.

But GQ doesn't believe Zuckerberg is spending any of that money on clothes: "Zuck's style is so poor, it even inspired a mock fashion line, Mark By Mark Zuckerberg, which thankfully doesn't sell any actual clothing."

Steve Jobs, whose salary as Apple CEO is just $1 per year, was named the second-worst fashion offender.